The aim of the "INTERLIS Test Suite" is to explicitly derive from the INTERLIS 2.3 Reference Manual a minimum set of rules for the validation of INTERLIS transfer files (version 2.3) and to define related test cases. The rules and the test cases are available in the directory doc: the test files and the corresponding models are available in the directory data. In addition, a test routine has been developed to run the Test Suite against the tools "ilivalidator" and "iG/Check".